Foot-control valve for hydraulic governors



L. T. HARRIGAN FOOT CONTROL VALVE FOR HYDRAULIC GOVERNORS Filed Nov. 9 1923 INVENTOR.

LUN T. HFIRRIGHN A TTORNEY Patented Dec. 2, i924.

STATES LON T. HAREIGAN, OF LOS ANGELES, CALIFORNIA.

FOOT-CONTROL VALVE FOR HYDRAULIC Application filed November 9, 1923. Serial no. s7a,se1.

To all whom it may concern:

Be it known that I, Lon T. HARRIGAN,

a citizen of the United States, residing at Los Angeles, in thecounty of Los Angeles and State of California, have invented new and useful Im rovements in Foot-Control Valves for Hy raulic Governors, of which 12, each of whic ceive a nipple, as shown at 13 and 14, At

the followin'g isa specification.

This invention relates to improvements in foot valves for hydraulic overnors. The principal object of this invention is to provide means whereby the operator of a motor vehicle can operate a foot'valve, forthe purpose of transferring fluid pressure c 5 from the hydraulic governor to the hydraulic braking mechanism. 1

Another object is to produce a device of this character which is extremely simple and one which may be applied to 'the standard hydraulic governor now upon the market.

A further object is to provide a device of this character which is simple in construction and one which will not become deranged:

through ordinary usage.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a vertical cross section of a hydraulic governor and brake cylinder having my valve applied thereto,

line 22 of Figure 1, a

Figure 3 is an enlarged'detail cross section of my foot valve as applied to the pressure line, and l 4.0 Figure 4 is a top plan view of Figure 3.

Heretofore, as far as applicant 1s aware of, h draulic overnors merely served to apply rakes w en a vehicle traveled at a greater rate of speed upon the pretermined setti-n of the overnor. Ap licant has there ore devise a valve who when inserted in the pressure line will transfer the pressure to the braking iston for the purpose of applying the bra as when the speed of the car upon which the sameis mounted istless than that for which the governor is so a In the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of m invention, the numeral 5 designates a bra e cylinder and Figure 2 is a cross section taken on thethe numeral 6 a'brake' rod passing throu h 5 a stuffing-box 7 in the end of the cylin er and connected to the piston 8. It is of course understood that this brake rod is connected to the customar brakes of the car'.-

A head 9 sea s the end of the cylinder 5. This cylinder isrovided with ports 11 and is screw-threaded to re-' 16 is shown a housing. within which is mounted a governor consisting of a yoke 17 having ball weights 18 and 19 pivoted thereto, which weights are connected through the medium of bell-crank levers, the ends of which are positioned within a collar '21. This collar is slidable upon a drive-shaft 22 and is connected by a yoke 23 to the stem 24 of=a valve 26. This valve is positioned within a casting 27 having a seat 28.

One end of this casting is connected by a pipe 29 to a return pipe 31. A pipe 32'is connected to a pressure ipe '33, one end of which is connected to t e nipple '13, while the opposite end is connected to a pump housing 34, within which is mounted pump ears 36 and 37 of the usual construction.

he pipe 31 is also connected to thetop of the pump casing 34 so as to complete a circuit for the pumped fluid. A'driving gear 38 is ositioned upon the end of the shaft 22.

Re erring now to Figure 3, it will be is provided at its lower portion wit a packing 46 having a washer 47 resting thereon.

A sprin .48 is positioned between the washer an head 42. Slots 49 and 51 are out in the casing 43 so as to receive a slidin 'cam 52 provided with a downturned en 53. The upper surface of this cam isadapted to contact a plug 54 pinned to the easlng 43. The result of this'construction is that when the vehicle is running, fluid will be pumped by the gears 36 and 37 so as to discharge into the pressure pipe 33 and as long as the valve 26 and the valve 41 are m retracted position, the fluid will pass pipe 31, and ack to the other side of the pump. When theg vernor operates thro h excessive speed, 0 rotation caused by t e gear 38 being connected to the propeller through the ipe 32, casting 27, pipe 29,

shaft of the vehicle, the valve 26 will be.

caused to ap roach its seat, with the result that as the flow through the casting 27 is cut off, pressure will be created in the pi e 33, which pressure will be transferred to the end of the piston 8 adjacent the head 9, thus forcing the piston rod 6 to the left of the drawing. The fluid which is upon the opposite side of the piston will then discharge through the port 22 into the pi e 31. The description of operation thus ar is common.

The change created by my invention consists in forcin the cam 52 to the left of the drawing, whic forces the plunger 41 to the position shown in Fi ure 1, with the result that flow is stopped t rough the pipe 29 resulting in'the pressure again being transferred to the piston 8 as before described. As soon as the cam 52 is retracted the normal circulation will again commence.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts ma be resorted to Without departing from t e spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim 1. In a device of the character described the combination with a hydraulic braking mechanism, having a fluid circulating system, of a casing secured to one of the pipes of the circulat ng system, a plunger-Valve mounted in said casing and a apted to extend into the circulating system, in such a manner as to be capable of stopping the flow within the system, a spring for retracting said valve, and a manually operated cam for depressing said valve against the action of said'sprin 2. In a device of the character described the combination with a hydraulic braking mechanism having a fluid circulating system, of a sliding piston controlled by the fluid pressure in said system, of a valve slidably movable in said system, a spring for normally maintaining said valve, a head formed on said valve, a casing surrounding said head and a major portion of said valve .out of the path of the moving fluid, and a manually slidable cam for depressing said valve, substantially as and for the purpose specified.

In testimony whereof I affix my signature.

LON T. :IARRIGAN. 

